/Engine/Plugins/Runtime/nDisplay/Source/DisplayClusterScenePreview/Public/DisplayClusterLightCardEditorHelper.h
If the root actor is a proxy, use this to set the corresponding level instance that is being proxied.
void SetLevelInstanceRootActor ( [ADisplayClusterRootActor](API\Plugins\DisplayCluster\ADisplayClusterRootActor) & NewRootActor )